rust/v1.0.0-beta.7

What's Changed

• Rust SDK API review fixes by @SteveSandersonMS in #1367
• Python SDK API review fixes by @SteveSandersonMS in #1376
• Add runtime_instructions system message section to all SDKs by @stephentoub in #1377
• Cross-SDK cleanup follow-ups from PR #1376 by @SteveSandersonMS in #1378
• Rust SDK: PR #1367 review follow-ups by @SteveSandersonMS in #1382
• Fix flaky SDK E2E tests by @stephentoub in #1379
• C# SDK: re-land x-opaque-json → JsonElement mapping with object boundary at RPC params by @SteveSandersonMS in #1359
• Implement phase 03 of merge to monorepo plan by @edburns in #1369
• Fix .NET package version props generation by @stephentoub in #1387
• Rust SDK: bundle Copilot CLI by default by @SteveSandersonMS in #1385
• Add Java-specific content to monorepo copilot-instructions.md by @edburns in #1391
• Java SDK: sync reference implementation to ^1.0.52-1, add preMcpToolCall hook, fix PingResponse timestamp type by @edburns in #1389
• Update @github/copilot to 1.0.52-4 by @github-actions[bot] in #1393
• Update @github/copilot to 1.0.52 by @github-actions[bot] in #1405
• Update @github/copilot to 1.0.53-2 by @github-actions[bot] in #1408
• Add SDK canvas runtime support by @jmoseley in #1401

Full Changelog: rust/v1.0.0-beta.6...rust/v1.0.0-beta.7